What's the fastest way to drop 20 lb?

The fastest safe way to lose 20 pounds is creating a consistent calorie deficit through diet and exercise over 10-20 weeks. Eat 500-750 fewer calories daily, focus on protein, vegetables, and whole foods, eliminate processed foods and sugary drinks, do cardio 4-5 times weekly, add strength training, drink plenty of water, and get adequate sleep. Consistency is more important than speed for lasting results.